“What do you see when you look in the Mirror [of Erised]?”
                
“I? I see myself holding a pair of thick, woollen socks.”
                
Harry stared.
                
“One can never have enough socks”, said Dumbledore. “Another Christmas has come and gone and I didn’t get a single pair. People will insist on giving me books.”

-- J.K. Rowling - Harry Potter and the Philosopher’s Stone